SU732220A1 - Method of automatic control of material sintering in rotating furnace - Google Patents

Description

The invention relates to techniques for regulating the firing process, for example, cement clinker in a rotary kiln.

A known method of regulating firing, including changing the fuel supply according to the temperature of the sintering zone pJJ. However, ⁵ this method does not provide fuel economy.

There is another way to automatically control the firing of materials in a rotary kiln, including changing ¹⁰ fuel supply ^ 2}. In this method, the temperature control of the sintering zone is also carried out by changing the fuel supply, which does not provide fuel combustion efficiency.

Pel invention - improving the efficiency of fuel combustion.

This is achieved in that the method for automatically regulating firing Part _m rials in a rotary kiln comprising changing the fuel supply further measure the degree of sintering is carried out and burnt material change feeding pulverulent raw material in the flame zone in inverse proportion to the degree of sintering.

The essence of the method is as follows.

The amount of fuel supplied does not change. The fuel supply to the furnace is kept constant in the amount of maximum thermal power. An increase in the amount of fuel burned makes it possible to increase the supply of material from the cold end of the furnace, thereby increasing the efficiency of the unit. To control the rate of clinker formation, raw powdery material is introduced into the torch zone of a rotary kiln — an additional factor affecting the degree of clinker formation. The amount of raw material introduced into the flare zone varies depending on the degree of clinker formation of the calcined material. The degree of clinker formation is evaluated either by weight of the volume of clinker, or by the number of CaO St. Located in suspension so732220 ³ standing in the zone of flame powdery raw material gas is heated to the temperature of the heat consuming fakela.Izmeneniya from feed gases in an amount of pulverulent material allow adjustment kpinkeroobrazovaniya rate in the sintering zone. A powdery material heated to the temperature of the torch settling along the length of the furnace promotes heat transfer to more energy-intensive zones, such as the decarbonization zone, which creates conditions for stable operation of the furnace. In addition, the supply of raw material to the hot end of the furnace increases its productivity. ₁₅ You can get clinker with

CaO St. 41% and weighing 1000-1100 g / liter. For clinker with these characteristics, to main calcined material, supplied with _cold-2 on the second end of the furnace, an additional supply of pulverulent raw material into the flame zone in an amount of 10-35%.

The method is implemented using a device, a block diagram of which is shown in figure 25.

The rotary kiln 1 is equipped with a fuel dispenser 2, a nozzle for supplying fuel 3, a nozzle for supplying air 4, a throttling valve, an air damper 5. For storage of powdered raw material, a hopper 6 is equipped. The powdery raw material is dispensed by the feeder 7 and thrown through the nozzle 8 into 4 torch zone of a rotary kiln. The degree of sintering of the calcined material is measured by a sensor 9, which through the regulator 10, the actuator 11 AND the electric motor of the feeder 7 changes the flow of the powdery material. Regulation of fuel combustion is carried out using an analyzer 12 bypass gases for oxygen content. The analyzer 12 through the regulator 13 and the actuator 14 acts on the air damper.

Claims (2)

When standing in the torch zone, the powdered material, heated to the temperature of the gases, takes away some of the heat from the torch gases. Changes in the amount of powdered material allow the rate of clinker to be controlled in the sintering zone. The powdered material heated to the temperature of the torch that precipitates through the furnace facilitates the transfer of heat to more energy-intensive zones, such as the decarbonization zone, which creates conditions for the stable operation of the furnace. In addition, supplying the raw material to the end of the furnace increases its capacity. You can get clinker with CaOce.1% and a weight of 1000-1100 g / l. To obtain clinker with the specified characteristics, the main calcined material supplied from the cold end of the kiln requires an additional supply of powdered raw material to the flare zone in an amount of 1 ~ 35%. The method is implemented using a device whose block diagram is shown in the drawing. The rotary kiln 1 is equipped with a fuel metering unit 2, a nozzle for supplying fuel 3, a nozzle, for supplying air 4, / fussel. Vaduha gate 5. The storage of the powdered raw material is equipped with a hopper 6. The powdered raw material is fed by a feeder 7 and the nozzle 8 is thrown into the zone of the flare of the furnace. The degree of sintering of the calcined material is measured by the sensor 9, which, through the regulator 10, the actuator 11 and the electric motor of the feeder 7, changes the supply of the powdered material. Combustion control is carried out using analyzer 12 bypassing gases for oxygen content. The analyzer 12 through the regulator 13 and the actuator 14 acts on the air damper. Claims The method of automatic control of calcining materials in a rotary kiln, including a change in fuel supply, characterized in that, in order to increase the burning efficiency, the degree of sintering of the material to be burned is additionally measured and the change in the feed of the powdered raw material into the flare zone is inversely proportional to depending on the degree of sintering. Sources of information taken into account in the examination 1. G. Drabkin et al. Automation of cement-plants, Leningrad, 1971, p. 342-360. 2. Authors certificate of the USSR 292121, cl. From 04 To 7/44, 1969,